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Mach band optical ray illusion—Drawing with the second differential

Authors
Journal
Computers & Graphics
0097-8493
Publisher
Elsevier
Publication Date
Volume
15
Issue
4
Identifiers
DOI: 10.1016/0097-8493(91)90054-l

Abstract

Abstract Mach bands running along convex ramp edges in a computer graphics image produce the illusion of optical rays, and a concave ramp edge defines an interface for “reflection.” The positive and negative brightness enhancements ( E) observed in the illusion are simulated by convolving the pattern of gradient increments ( Δg) computed at the edges with a Gaussian kernel ( G): E ∝ − Δg ⊗ G.

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